If scratch building, go for the original look... the Dumas prop is more modern. The old timers' props looked like a cross between today's ship props and an airplane prop... and likely as not made of cast iron!

And once you have the cad model... Then what?
Enquiring minds are interested...

I use Turbocad 3d when I want to scratchbuild something. In this case, I'll experiment with different blade shapes and twists until I get something I like, then I take measurements and build the parts.